feat(health): 添加文章修订历史查询 API — GET /health/articles/{id}/revisions

补全 ArticleRevision 实体的读取查询（之前仅有写入 save_revision），
新增 list_revisions service + handler + 路由，支持分页。

crates/erp-health/src/handler/article_handler.rs

@@ -203,3 +203,29 @@ where
     article_service::increment_view_count(&state, ctx.tenant_id, id).await?;
     Ok(Json(ApiResponse::ok(())))
 }
+
+#[derive(Debug, serde::Deserialize)]
+pub struct ListRevisionsQuery {
+    pub page: Option<u64>,
+    pub page_size: Option<u64>,
+}
+
+/// 查询文章修订历史
+pub async fn list_revisions<S>(
+    State(state): State<HealthState>,
+    Extension(ctx): Extension<TenantContext>,
+    Path(id): Path<uuid::Uuid>,
+    Query(params): Query<ListRevisionsQuery>,
+) -> Result<Json<ApiResponse<PaginatedResponse<crate::dto::article_dto::ArticleRevisionResp>>>, AppError>
+where
+    HealthState: FromRef<S>,
+    S: Clone + Send + Sync + 'static,
+{
+    require_permission(&ctx, "health.articles.list")?;
+    let page = params.page.unwrap_or(1);
+    let page_size = params.page_size.unwrap_or(20);
+    let result = article_service::list_revisions(
+        &state, ctx.tenant_id, id, page, page_size,
+    ).await?;
+    Ok(Json(ApiResponse::ok(result)))
+}